to me, Kurt smiled because he found Charles comment funny, knowing that there are many mutans with powers like that.

But......... now that I think about it, since the x-men appeared on uniforms at the White house, its really possible that after Alkali lake events, the x-men went back to the school, where most of the students returned, including Kitty and Colossus, sooooooo, there is the possibility that Kurt ended meeting Kitty for the very first time.

I like the idea of it, and want to feel THAT happened. you know, those cool offscreen moments we didnt see, but probably happened.